<!DOCTYPE html>
<html>
<head>
  <meta http-equiv = "content-type" content = "text/html" charset = "utf-8"/>
  <title> 塔罗牌 </title>
  <script>
      window.onload=function(){
            var canvas=document.getElementById('canvas');
            var cx=canvas.getContext("2d");
            cx.translate(220,30);
            cx.fillStyle='rgba(255, 0, 0, 0.25)';
            for (var i = 0; i < 50; i++) {
                //图形向左、向下各移动25
                cx.translate(25, 25);
                //图形缩放
                cx.scale(0.95, 0.95);
                //图形旋转
                cx.rotate(Math.PI/10);
                cx.fillRect(0, 0, 100, 50);
            }
      }
  </script>
</head>
<body>
  <canvas id="canvas" width="400px" height="300px" style="background-color: rgb(223, 199, 199);"></canvas>
</body>
</html>